I have a Pioneer Elite PRO-940 - problem exists when the tv is powered off - a component (might be a power supply or transformer) kicks on within a second or two after being turned off - emits a low humming sound - doesn't seem to affect any operation...any advice?

I have no audio or video components attached to this TV other than HD cable box; the only cables useed are a cable coax and a HDMI cable; the TV is hung from a std wall mount; it appears that the hum is coming from the TV speaker, again, immediatley after the TV is powered OFF???I have no audio or video components attached to this TV other than HD cable box; the only cables useed are a cable coax and a HDMI cable; the TV is hung from a std wall mount; it appears that the hum is coming from the TV speaker, again, immediatley after the TV is powered OFF???

I tried turning the TV off with the remote and the ON/Off button - no change, as I still hear the humming noise. BTW, the power cord from the TV is plugged into a 900 joule surge protector...fyi...I've even tried plugging direct into outlet (bypassing the surge protector)...no change...I tried turning the TV off with the remote and the ON/Off button - no change, as I still hear the humming noise. BTW, the power cord from the TV is plugged into a 900 joule surge protector...fyi...I've even tried plugging direct into outlet (bypassing the surge protector)...no change...

When you shut off the set, most of the set is off, there is a portion that runs continuously. This is what allows you to use a remote to turn it on. Normally, the only active circuit is the CPU and the InfraRed receiver. Once the IR receives a power on from the remote, the CPU turns on the remainder of the set. It sounds like the audio amp section is not completely shutting down quickly enough. I am assuming that the hum stops after a period of time. This can be because of a defective bleeder resistor that normally drains the power supply voltage once the set is turned off. This is not harmful, just annoying. If the hum remains on without stopping, then that is another issue. I'll try to get the service lit on this to get you the probable part.

It could be picking up AC noise from the ground on the electric socket, caused by your air conditioner, fridgerator, etc.. Try plugging in the TV to a different electric plug, or buy a special surge strip that eliminates dirty AC power. Like this one made by APC. Monster also makes one but is a lot more expensive.

Try to turn it off first using the remote, then press the power button on the TV... it is better to use a surge protector or an outlet with a transformer, thatg can regulate the power that connect to the tv..

any other devices that are near the television? have you tried unplugging power cable and replugging it on a different power surge? try that as well and keep away other devices that interferes or that may cause humming sound. thanks!

Hi-

any other devices that are near the television? have you tried unplugging power cable and replugging it on a different power surge? try that as well and keep away other devices that interferes or that may cause humming sound. thanks!

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Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Pioneer Elite Pro rear projection 620HD - Picture is still there but brightness and "white" have faded over years allowing for mediocre viewing when room is dark only. During the daylight picture is visible if viewed straight on and within 15 feet from set. Any suggestions?

The failure is not on the power supply but the convergence amplifiers STKICs have the 24 volts shorted.
If that fuse is blowing, de-solder the convergence ICs and put a new fuse to power up the TV; you should see distorted video when the TV powers up and the fuse should not blow.
The service manual migth not help much in this case since the failure is easy to pin point.

your tv's hardware might got the problem. this should fix with an expert technician that they have a tools for fixing this problem. if repairing will cost you alot then i suggest that you have to buy a new tv insted of repairing your old tv. hope that helps!

We are having the same problem of the Pioneer Elite Pro-99 turning itself off all of a sudden. The red 'non' power button comes on as if we had turned it off remotely.We would love to resolve this. If you can help let us know.

It is most likely just solder connections on your power supply. If the only diag LED that lights is on the supply, then thats usually the case. You can unplug the set and remove the supply to fix it with a little soldering. You have to remove the metal board supporter from the bottom of the board and solder quite a few connections. Look for cracked connections on the power connectors to the rest of the set, and also connections on the main transformer. If you need soldering experience, get a kit at radio shack and build a little project to get some practice.

My set is doing the same thing again. The last time I fixed this (4 years ago) it was a capacitor gone bad in the power supply for the 24v standby circuit. (C166)
The service manuals can be ordered directly from Pioneer Part Number ARP3014 for Pro-100 model.